INDUSTRY COMPONENT

Basicity Modifier

A chemical component in chrome tanning solutions that precisely controls pH levels for optimal chromium absorption and leather quality.

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Component Specifications

Definition
The Basicity Modifier is a critical chemical component in chrome tanning agent solutions that regulates the alkalinity (pH) of the tanning bath. It controls the rate and degree of chromium salt fixation to collagen fibers in hides, determining the leather's shrinkage temperature, softness, grain smoothness, and color uniformity. Proper basicity adjustment ensures maximum chromium uptake while minimizing environmental discharge.
Working Principle
Operates through controlled neutralization reactions that gradually increase the pH of acidic chromium(III) sulfate solutions. As basicity rises from 33% to 67%, chromium complexes transition from cationic to neutral to anionic states, allowing deeper penetration and stronger cross-linking with collagen carboxyl groups. The modifier releases alkaline ions at a controlled rate to prevent pH spikes that could cause surface precipitation.
Materials
Typically sodium bicarbonate (NaHCO₃), sodium carbonate (Na₂CO₃), magnesium oxide (MgO), or proprietary alkaline blends. High-purity grades (>99%) with controlled particle size (50-150μm) to ensure consistent dissolution rates. Free from chloride and sulfate contaminants that could interfere with chromium complexes.
Technical Parameters
  • Purity >99%
  • Bulk Density 0.8-1.2 g/cm³
  • Basicity Range 33-67%
  • Sulfate Content <200 ppm
  • Chloride Content <100 ppm
  • Dissolution Time <5 minutes
  • Moisture Content <0.5%
  • pH Adjustment Rate 0.2-0.5 pH units/minute
Standards
ISO 5398, DIN 53308, IULTCS/IUP 6

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Basicity Modifier.

chrome tanning basicity modifier leather tanning pH control chromium fixation agent tanning chemical component sodium bicarbonate tanning leather quality control Basicity Modifier Basicity Modifier in Leather and Related Product Manufacturing

Parent Products

This component is used in the following industrial products

Chrome Tanning Agent Solution

Industrial chromium-based chemical solution for leather tanning

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Engineering Analysis

Risks & Mitigation
  • Chemical burns from alkaline materials
  • Inhalation of fine dust during handling
  • pH overshoot damaging leather quality
  • Incompatibility with certain chromium complexes
  • Environmental discharge of unreacted alkali
FMEA Triads
Trigger: Inaccurate dosing due to equipment calibration error
Failure: Off-spec basicity causing uneven tanning or leather defects
Mitigation: Implement automated dosing with pH feedback control, regular calibration checks, and manual verification samples
Trigger: Moisture absorption during storage altering dissolution rate
Failure: Uneven pH adjustment and inconsistent leather quality
Mitigation: Store in sealed containers with desiccants, monitor warehouse humidity, use first-in-first-out inventory rotation
Trigger: Contaminants in modifier reacting with chromium salts
Failure: Precipitation of chromium complexes reducing tanning efficiency
Mitigation: Supplier quality audits, incoming material testing, and filtration systems in tanning baths

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±2% basicity from target value, ±0.1 pH units in final bath
Test Method
ISO 5398-1 for chromium determination, pH meter calibration per ISO 10523, titration methods for basicity calculation

Buyer Feedback

★★★★☆ 4.8 / 5.0 (20 reviews)

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Leather and Related Product Manufacturing sector, I confirm this Basicity Modifier meets all ISO standards."

"Standard OEM quality for Leather and Related Product Manufacturing applications. The Basicity Modifier arrived with full certification."

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Frequently Asked Questions

Why is basicity control important in chrome tanning?

Proper basicity (33-67%) determines chromium fixation efficiency, leather shrinkage temperature, and physical properties. Low basicity causes poor penetration and soft leather; high basicity causes surface precipitation and grain damage.

What happens if basicity modifier is added too quickly?

Rapid addition causes localized pH spikes that precipitate chromium on the hide surface, resulting in uneven tanning, grain roughness, and reduced chromium uptake in the leather interior.

Can different basicity modifiers be used interchangeably?

Not directly. Sodium carbonate acts faster than bicarbonate; magnesium oxide provides more gradual adjustment. Switching requires recalibration of addition rates and monitoring to maintain target basicity curves.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Chromium Sulfate Complex